A-LevelPhysicsIdeal gasesMay/June 2012Paper 1 Q211 Mark
In an experiment to demonstrate Brownian motion, a transparent container is filled with smoke particles suspended in air. What can be seen when the contents of the container are strongly illuminated and viewed through a microscope?
Aair molecules that are colliding with smoke particles
Bair molecules that are moving in straight lines
Csmoke particles that are moving in random zigzag paths
Dsmoke particles that are moving in straight lines
✓ Correct Answer
The correct answer is C: smoke particles that are moving in random zigzag paths
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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